The two correct assumptions the writer can safely make about the intended audience are:
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They have a basic knowledge of how social media works. This assumption is reasonable since the audience has been using an old social media platform, indicating familiarity with social media concepts and functionalities.
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They are in favor of the new social media platform.
This assumption is valid because the essay is aimed at helping users transition to the new platform, suggesting that they are at least open to or interested in engaging with it.